Used to record the pulse pressure at the wrist
Metal instrument with wires, knobs and a short strap attached. A sensitive manometer sits on the radial pulse and is amplified by means of a weighted pulley. A clockwork mechanism turns a roller which winds recording paper under the needle to record a trace.
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Dudgeon, R. E. (Robert Ellis), 1820-1904 and Arnold & Sons (London, England), “Dudgeon's Sphygmograph,” Digital Collections - University at Buffalo Libraries, accessed November 27, 2020, https://digital.lib.buffalo.edu/items/show/16871.